I see your point, but I think that those of us who see your assertions is "overreactions" has more to do with the language you use, more than the general bent of your argument (that and you tend to mention it everywhere):
To wit: "Outright Hostility WotC shows toward DMs" is IMO quite overblown.
I think that all the ways in which you point out that they fail to do a good job of empowering DMs have merit - your argument is sound - but I think you probably turn a lot of your potential allies away with your passion.
It's far more likely to be an issue of Hanlon's Razor (Never Attribute to Malice What can be Explained by Incompetence", though even that is possibly too strong - it's not necessarily incompetence on the part of the designers, so much as stuff that is "lost in the shuffle" (of goals vs results vs other priorities).
So, yeah. I think that the game could be improved in many of the ways that you advocate, but I think that your Good Fight is lost in hyperbole.
I enjoy debating with you, though!